Electric alarm



(No Model.)

R.PENNB.Y.

. ELECTRIC ALARM. No. 588,004. Patented Aug. 10,1897.

' through the center of the helix.

UNITED STATES PATENT OFFICE.

RICHARD PENNEY, NATIONAL MILITARY HOME, OHIO.

ELECTRIC ALARM.

SPECIFICATION forming partof Letters Patent No. 588,004, dated August 10, 189'?.

Application iilecl January 2, 1897.

.To all whom it may concern- Be it known that I, RICHARD PENN EY, a citizen of the United States, residing at National Military Home, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Electric Alarms; and I do hereby declare that the following is a full, clear, and exact description of the invention,which will enable oth ers skilled in the art to which it appert-ains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this speeication.

My invention relates to improvements in electric alarms, the features of which will be fully hereinafter described and claimed.

The object of my invention is to produce a loud musical sound adapted for use on streetcars or other special uses which shall be readily distinguishable from ordinary bells and whistles.

The object is accomplished by the device illustrated in the accompanying drawings, in which- Figure l is a side elevation of the device with a portion of resonator cut away. Fig. 2 is a transverse vertical section of the same Fig. 3 is a side view of the vibrator-points.

Like letters and numerals designate like parts in the several views.

The standard H serves to support the device and may be constructed in any form adapted to attachment to a wall or platform. The same is provided with an orice through which the supporting-rod D is passed. This rod is threaded and is provided with two nuts to bind the neck of the resonator A within the standard. The external nut G only is shown. The circular strap `O embraces the helix, and the ends are secured to the supporting-rod by the screw 5, and thereby said helix is securely held within the center of said resonator. The resonator Ais cylindrical in form, open at one end and closed at the other, with a neck for attachment to a sup- Serial Noi 617,741. (No model.)

port, and may be constructed of brass or other suitable non-magnetic substance. closed end is attached the binding-post 6, to

which the conductingwire P is connected.

On the opposite side from said binding-post is provided an orifice for the conducting-wire N, which is one terminal of the helical coil, the other being connected to the iron vibrating point 1. The helix B is formed, as usual, of covered wire coiled on a spool and is held within the resonator, as before described. Within the orifice of the spool is held the brass tubing 4, and within which are freely held the two vibrating points l and 2. rIhese points are held normally against the inner surface of the resonator by the resiliency of the spiral spring 3. The conducting-wires P and N are connected with the electrodes of a dynamo.

The operation is thus: IVhen the current is turned on, the inductive force draws the vibrating points inwardly and from contact with the resonator, which forms a part of the electric circuit, and when thus broken the spring thrusts out said points to again renew the circuit, and thus said points reciprocate rapidly, producing by their action on the resonator a loud sound.

Having fully described myinvention, what I claim, and desire to secure by Letters Patent, is

In an electric alarm the combination with a suitable standard, the hollow resonator, the helix rigidly held on an arm centrally within said resonator, the iron vibratory points held centrally within said helix and normally in contact with the inner surface of said resonator bythe action of an intermediate spiral spring, and an electric circuit through the device, substantially as set forth.

In testimony that I claim the foregoing as my own I affix my signature in presence of witnesses.

RICHARD PENNEY. Iitnesses:

B. PICKERING, WILLIAM G. SMITH, CHARLES P. DEWEY. 

